Series GX15 Pneumatic Chemical Injection Pump
Operating Manual
CP-MAN-PRD-GX15
REV06
EFF. DATE 07/23/2019
Page 7 of 12
1.3.5
Faster pump speeds can be obtained by increasing the above minimum required gas inlet pressure.
NOTE:
To find the Amplification Ratio for your pump, please see Figure 2 below.
NOTE:
If the formula in Section 1.3.5 yields a result less than 20 PSIG (1.38 BARG), use a minimum supply
pressure of 20 PSIG (1.38 BARG).
FIGURE 2: AMPLIFICATION RATIO TABLE, Series GX15
PLUNGER
DIAMETER (IN)
AMPLIFICATION RATIO
1/8
144
1/4
36
1.3.6
Series GX15 pumps are Gas Recovery (GR) Models. Connect the gas recovery line from the process to the
open ¼” tubing connector on the lower branch tee of the
motor
. The pressure in the recovery line (“recovery
pressure”) must be lower than the supply pressure. To calculate the
maximum recovery pressure given your supply
pressure in PSIG, use the following formula:
RECOVERY PRESSURE
= SUPPLY PRESSURE - 30 PSIG
1.3.7
The maximum recovery pressure based on a maximum supply pressure of 150 PSIG is 120 PSIG.
2.
PUMP OPERATION
2.1
Bleeding/Priming the Injector Head
NOTE:
Prior to initial pump operation ensure the suction check valve is connected to adequate chemical
supply per Section 1.2.
2.1.1
Open the chemical supply block valve
2.1.2
Open the process block valve.
2.1.3
Open the air supply block valve.
CAUTION:
OTHER THAN DURING BRIEF TESTING, NEVER OPERATE THE PUMP WITHOUT CHEMICAL
SUPPLY FLOWING FREELY. DOING SO WILL CREATE UNDUE FRICTION AND HEAT, DECREASE
THE LIFE OF THE PLUNGER SEAL, HASTEN CHEMICAL LEAKAGE AND VOID THE PUMP
WARRANTY.
2.1.4
Open the speed control valve by turning the knob counterclockwise. The pump will pick up speed as the
speed control valve is opened. Continue to turn the knob until the pump is cycling a minimum of 60 strokes/minute.
This may take several turns of the speed control valve.
2.1.5
Open the bleed screw 1/2 to 2 1/2 turns. The pump will begin to pull air and chemical through the chemical
supply plumbing, into the head, and out the port in the bleed valve. Leave the valve open until a solid stream of
chemical pumps out of the bleed port each stroke.
